The basic version is a good free trial.  The main differences between the free version and the pro/premium version are:

  1. Pin labels (see sample:
  2. Circles around pins (see sample:
  3. Number of pins on the map 1500 and 15K vs 250 (see sample:
  4. High speed geo-coding 50 per second (for datasets larger than 60) vs 1/second.
  5. Pdf and image generation
  6. Custom Pins (and a custom logo for premium) (see sample:
  7. The number of pin colors (20 vs 7)
  8. Password protected maps. (see sample:

Most features have sample maps besides the increased pin colors and pdf/image generation.